Construct an explanation based on evidence for how natural selection leads to adaptation of populations.

  1. Animals

    Ocean animals have mushroomed in size

    Compared to a half-billion year ago, sea creatures are, on average, roughly 150 times bigger, a new study finds.

  2. Fossils

    Dinos ‘quickly’ shrunk into birds

    Scientists had long known birds descended from dinosaurs. A study now shows that the morphing from dinos into birds went along with a quick and steady shrinking of their body sizes.

  3. Fossils

    This dino-bird is super-feathered

    This late-Jurassic dino was also a bird. Its ample coat of feathers emerged before any need for flight.

  4. Animals

    When a species can’t stand the heat

    When temperatures rise, New Zealand’s tuatara produce more males. With global warming, that could leave the ancient reptile species with too few females to avoid going extinct.

  5. Life

    Caught in the act

    Scientists observe some evolutionary speed demons as they adapt over the course of just a few years to new environmental conditions.

  6. Chemistry

    A plant enemy’s enemy

  7. Fossils

    A really big (but extinct) rodent